I have a water heater in the basement that vent thru the wall into a money chimney.
However, the chimney is falling apart and needs to be removed.

Can the chimney be replaced by a B vent all the way up to the roof line? If not, what can I use for exterior flue? I am in northern california if it matters.

Thank you for your advise.

B-vent it above the roof.

use a special wall thimble for the wall panetration and have a tee as the base of the chimney.
looks like this

Thanks Steve. I am sorry but I think my post was not too clear after I just read now.

It is a flat roof so the B vent would have to be at least 12 " above the roof. However, I was talking about replacing the masonry chimney by a full B vent. The B vent would be exposed to the outdoor and run about 20 ' vertically parallel to the exterior wall.

I guess my question is : is it ok to have a B vent chimney outside and exposed to the outdoor below roof line?

Thank you.

Nice thimble. I was planning on using one.

My question was more about the chimney itself. The masonry one is a goner.

Can I just run 20' of B vent vertically outside and exposed to the element ?

it is perfectly legal..
brace it well and as i said, use a tee at the bottom so you can clean it out if needed.
the horizontal run inside the building can be 50% of the vertical height.
use b-vent for the wall penetration along with an approved wall thimble.

Thanks packy.I was looking at the tee support which allow for a clean out cap on the bottom tee similar to one of those

Also, how much spacing should I be looking at for the bracing? every 4', 8' ...



Edited 2 times.

Nick, per the CA Plbg Code, you use the spacing the pipe manufacturer recommends(probably will be 4').

thank you steve



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the braces are cheap so use them at 4 feet. more is better than less.